
B–63325EN/03
2. 15i SERIES HARDWARE
159
WARNING
Only those personnel who have received approved safety
and maintenance training may perform this replacement
work.
Before opening the cabinet to replace a board, ensure that
both the power to the CNC and the main power to the power
magnetics cabinet are turned off. If only the CNC power is
turned off, the servo unit may still be powered during the
board replacement work, possibly causing damage to the
board and peripheral units, as well as presenting the risk of
electric shock to the user.
CAUTION
When replacing the printed circuit board, note the
following:
(a) When demounting the board, be careful not to touch the
semiconductor devices and other parts on the board.
(b) Ensure that the parts on the new board are correctly
configured.
(c) Once the replacement work has been completed, adjust
the board as necessary.
(d) Before replacing the power supply unit or main board
(together with the mounted cards and modules), back up
the data (such as parameters and programs) in the SRAM
memory of the CNC to a media such as a memory card or
floppy disk. Otherwise, the SRAM memory data may be
lost during the replacement work.
(e) Reconnect any cables disconnected during the
replacement work. If there is a chance of forgetting how
the cables are connected, make a note before
disconnecting them.
CAUTION
Before starting the replacement work, ensure that the main
power to the control unit is turned off. The main board
contains the battery–backed memory for data such as CNC
parameters and programs. This data may be lost as a result
of replacing the main board.
2.5
REPLACING THE
PRINTED CIRCUIT
BOARDS
2.5.1
Replacing the Power
Supply Unit, Main CPU
Board, and Full–size
Option Board